In an n-p-n transistor biased for operation in forward active region emitter is

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Question
In an n-p-n transistor biased for operation in forward active region
Options
A. emitter is positive with respect to base
B. collector is positive with respect to base
C. base is positive with respect to emitter and collector is positive with respect to base
D. none of the above

Correct Answer

base is positive with respect to emitter and collector is positive with respect to base

Explanation

In forward active mode emitter base junction is forward biased and base collector junction is reverse biased.

Electronic Devices and Circuits problems

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1. The power dissipation in a transistor is the product of
Options
A. emitter current and emitter to base voltage
B. emitter current and collector to emitter voltage
C. collector current and collector to emitter voltage
D. none of the above

2. In a degenerate n type semiconductor material, the Fermi level,
Options
A. is in valence band
B. is in conduction band
C. is at the centre in between valence and conduction bands
D. is very near valence band

3. The normal operation of JFET is
Options
A. constant voltage region
B. constant current region
C. both constant voltage and constant current regions
D. either constant voltage or constant current region

4. A particular green LED emits light of wavelength 5490, �, the energy bandgap of the semiconductor material used there is .. h = 6.6 x 10^-34 J sec.
Options
A. 2.26 eV
B. 1.98 eV
C. 1.17 eV
D. 0.74 eV

5. Ferrite have
Options
A. low copper loss
B. low eddy current loss
C. low resistivity
D. higher specific gravity compared to iron

6. In a zener diode
Options
A. the forward current is very high
B. sharp breakdown occurs at a certain reverse voltage
C. the ratio v-i can be negative
D. there are two p-n junctions

7. As compared to an ordinary semiconductor diode, a Schottky diode
Options
A. has lower cut in voltage
B. has higher cut in voltage
C. lower reverse saturation current
D. both (b) and (c)

8. A periodic voltage has following value for equal time intervals changing suddenly from one value to next... 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. Then rms value of the waveform is
Options
A. 31 V
B. 32 V
C. insufficient data
D. none of these

9. Assertion (A): When a high reverse voltage is applied to a p-n junction the diode breaks down.
Reason (R): High reverse voltage causes Avalanche effect.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

10. An LED has a rating of 2 V and 10 mA. It is used along with 6V battery. The range of series resistance is
Options
A. 0 to 200 ?
B. 200 - 400 ?
C. 200 ? and above
D. 400 ? and above

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